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Security Fundamentals & Crypto · Foundational

Simple Network Management Protocol version 3 (SNMPv3)

Version of SNMP adding user-based authentication and encryption for device monitoring and management.

Definition

SNMPv3 supports security levels noAuthNoPriv, authNoPriv, and authPriv, with SHA-based authentication and AES encryption. SNMPv1 and v2c send community strings in cleartext and should be disabled. SNMP uses UDP 161 for queries and UDP 162 for traps.

Example

snmp-server group NETOPS v3 priv configures a Cisco device to require authPriv for SNMPv3 users.

Exam tip

Use SNMPv3 with authPriv; v1/v2c community strings are plaintext.

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